create.js.erb in spina-0.6.13

- old
+ new

@@ -1,5 +1,3 @@
-<% if @attachment.new_record? %>
-  alert("Document kon niet worden verwerkt: <%= j @attachment.errors.full_messages.join(', ').html_safe %>");
-<% else %>
+<% unless @attachment.new_record? %>
   $(".table-prepend-document").prepend("<%= j render partial: 'spina/admin/attachments/attachment', object: @attachment %>");
 <% end %>